So I'm toying with the idea of having neurotoxin as a prop for my GLaDOS cosplay. Originally I thought of using a needle but then figured that wouldn't make much sense since it's a gas.
Anyone have any ideas for what I could use?

so you could always make like... a little version of the tank and put a biohazard sign on it and a "neurotoxin" label? i swear i've seen a tutorial somewhere where someone made cosplay tanks out of 2 liter soda bottles....

Hmm, that sounds like a good idea. Someone on another forum suggested using a container filled with green liquid and attaching a hose to it with like a sprayer nozzle. He pointed out that some gases are liquids when under pressure...
But maybe I can combine the two ideas...

using a spray bottle to threaten people with neurotoxin could be really funny--and refreshing! just make sure if you spray people that it's the bottle that's colored and not the water or else you could run the risk of dying everyone green. XD

Ha, that would be funny, but I wouldn't go around spraying people honestly. Maybe my friends, and perhaps if they wanted me to, people at the photoshoot. But I will keep all these ideas in mind. Thanks!

Maybe one of those old pumps people used to use to pump out fumigation gasses?
Sort of like this, but with an aperture twist on it:
https://okl.scene7.com/is/image/OKL/Product_ALH00329_Image_1?$product$

Maybe one of those old pumps people used to use to pump out fumigation gasses?
Sort of like this, but with an aperture twist on it:
https://okl.scene7.com/is/image/OKL/Product_ALH00329_Image_1?$product$

Oh wow that would have been so perfect! I actually went with the soda bottle/tank thing; it's not perfect, but it came out decent enough. I added a tube and sprayer to it. But maybe I will try to do something like this later on. I really, really like that idea! Thank you!
EDIT: Actually, this idea is too awesome to put aside. I'm totally doing it.

Oh wow that would have been so perfect! I actually went with the soda bottle/tank thing; it's not perfect, but it came out decent enough. I added a tube and sprayer to it. But maybe I will try to do something like this later on. I really, really like that idea! Thank you!
EDIT: Actually, this idea is too awesome to put aside. I'm totally doing it.

You're welcome! Haha You should definitely post a picture of when it's done! Would love to see it!